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NABCEP PV Installation Professional (PVIP) Board Certification Sample Questions:

1. Which of the following voltages should be included on the dc disconnected label to indicate MAXIMUM system voltage?

A) 600 V
B) Source circuit V
C) Temperature-corrected V
D) Non-temperature-corrected V

2. A metal condult containing an array circuit with Vmo of 400Vdc is connected to a metal enclosure at the location where the concentric knockouts have been punched by the manufacturer. Which method of attachment should be used?

A) Grounding bushing
B) Insulated bushing
C) Threaded coupling
D) Sealing locknut

3. An installer is hired to troubleshoot a 10-year-old roottop system with open-circuit voltage of 300V. The ground-fault detection (GFD) device has tripped. The insulation on the exposed source circuit cables has deterlorated with multiple cracks and has no flexibility. Which concern is the MOST likely safely issue when servicing this array?

A) Short-circuit current is present at the PV source-circuit terminals of the disconnect device because of electrical leakage.
B) Insulation has become an electrical conductor since it has changed its composition.
C) Ungrounded conductors are conducing current event the ground-fault device has activated.
D) Cracked insulation has allowed water intrusion that resulted in oxidation of the copper conductors.

4. A module's Voc is 40V at STC. At -5°C with a coefficient of -0.33%/°C, what is the Voc?

A) 45.0V
B) 44.0V
C) 42.0V
D) 43.0V

5. A PV system has a 1000V DC array feeding a transformerless inverter. What is the minimum insulation rating for the DC conductors per NEC 690.35?

A) 1500V
B) 600V
C) 2000V
D) 1000V

Solutions: